[v1,5/8] dts: add Node base class

diff --git a/dts/framework/node.py b/dts/framework/node.py
new file mode 100644
index 0000000000..ba9e9574bc
--- /dev/null
+++ b/dts/framework/node.py
@@ -0,0 +1,95 @@ 
+# SPDX-License-Identifier: BSD-3-Clause
+# Copyright(c) 2010-2014 Intel Corporation
+#
+
+from .logger import getLogger
+from .settings import TIMEOUT
+from .ssh_connection import SSHConnection
+
+"""
+A node is a generic host that DTS connects to and manages.
+"""
+
+
+class Node(object):
+
+    """
+    Basic module for node management. This module implements methods that
+    manage a node, such as information gathering (of CPU/PCI/NIC) and
+    environment setup.
+    """
+
+    def __init__(self, node, sut_id=0, name=None):
+        self.node = node
+
+        self.logger = getLogger(name)
+        self.session = SSHConnection(
+            self.get_ip_address(),
+            name,
+            self.get_username(),
+            self.get_password(),
+            sut_id,
+        )
+        self.session.init_log(self.logger)
+
+    def get_ip_address(self):
+        """
+        Get SUT's ip address.
+        """
+        return self.node["IP"]
+
+    def get_password(self):
+        """
+        Get SUT's login password.
+        """
+        return self.node["pass"]
+
+    def get_username(self):
+        """
+        Get SUT's login username.
+        """
+        return self.node["user"]
+
+    def send_expect(
+        self,
+        cmds,
+        expected,
+        timeout=TIMEOUT,
+        verify=False,
+        trim_whitespace=True,
+    ):
+        """
+        Send commands to node and return string before expected string. If
+        there's no expected string found before timeout, TimeoutException will
+        be raised.
+
+        By default, it will trim the whitespace from the expected string. This
+        behavior can be turned off via the trim_whitespace argument.
+        """
+
+        if trim_whitespace:
+            expected = expected.strip()
+
+        return self.session.send_expect(cmds, expected, timeout, verify)
+
+    def send_command(self, cmds, timeout=TIMEOUT):
+        """
+        Send commands to node and return string before timeout.
+        """
+
+        return self.session.send_command(cmds, timeout)
+
+    def close(self):
+        """
+        Close ssh session of SUT.
+        """
+        if self.session:
+            self.session.close()
+            self.session = None
+
+    def node_exit(self):
+        """
+        Recover all resource before node exit
+        """
+        self.close()
+        self.logger.logger_exit()
diff --git a/dts/framework/settings.py b/dts/framework/settings.py
new file mode 100644
index 0000000000..d62083969e
--- /dev/null
+++ b/dts/framework/settings.py
@@ -0,0 +1,8 @@ 
+# SPDX-License-Identifier: BSD-3-Clause
+# Copyright(c) 2010-2021 Intel Corporation
+#
+
+"""
+Default session timeout.
+"""
+TIMEOUT = 15